Telephone-transmitter



(No Model.) 2 Sheets-Sheet 1m J. W. BONTA. TELEPHONE TRANSMITTER. No. 365,777. PatentedJuly 5, 1887.

2 Sheets-Sheet 2.

(No Model.)

' J. W. BONTA. TELEPHONE TRANSMITTER.

Patented July 5, 1887.

INVENTOR 4 ATTORNEY WITNESSES.-

wumngrapher, Wahington. n c

UNITED STATES JAMES W. BONTA, OE PHILADELPHIA,

PENNSYLVANIA, ASSIGNOR TO THE AMERICAN NATIONAL TELEPHONE COMPANY, OF NEWV YORK.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 365,777, dated July 5, 1887. Application filed Octubcrill, 18536. Serial No. 216,704. (No model.)

To all whom it may concern.-

Be it known that I, JAMES W. BONTA, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Telephonic Transmitters, of which the following is a specification. My invention has relation to the form of telephonic transmitters shown and described to in Letters Patent of the United States N 0. 333,816, and dated January 5, 1886, wherein a loose rolling electrode in contact with an electrode affixed to the diaphragm is supported upon a pivoted inclined block or plate having I 5 an adjusting-screw for altering the inclination of the block or plate in order to vary the degree of initial or normal contact between the electrodes.

My present invention has for its object to 2:) obtain the normal or initial contact between the electrodes by means of a loose rolling weight or ballast separate from but impinging against the loose rolling electrode, both of which are upon or supported by the inclined block, and also to obtain variations in the degree or extent of such initial contact-pressure by substituting or using loose rolling weights or ballast either of different sizes or of the same size, but of different density or gravity, the inclined table being separate from the diaphragm, and, when adjustable as to its inclination, the latter is varied without moving or independently of the diaphragm. In using the loose rolling ballast or weight for giving 3 5 initial contact-pressure to the electrodes and for varying such pressure, the inclined plate or block may be a fixed block, instead of being pivoted, as shown in said patent; but, if desired, the block may be a pivoted one, and

the screw or other mechanism for varying the inclination of the block may be employed to further regulate theinitial contact-pressure between the electrode in addition to or re enforcing that secured by the loose rolling weight or ballast.

My invention accordingly consists of a telephonic transmitter having a loose rolling electrode upon an independent or separate inclined block or plate andin contact with diaphragm,

or with an electrode on the diaphragm, and a loose rolling weight or ballast on said block or plate back of and impinging against the loose rolling electrode, and, further, to combination, construction, and arrangement of detail parts,as hereinafter described and claimed.

Referring to the accompanyingdrawings, which illustrate telephonic transmitters embodying myinvention, Figure 1 is a vertical section showing fixed inclined block or plate. Fig. 2 is a like view showing pivoted form of: inclined block or plate with adjusting-screw; and Figs. 3 and t are detail elevations showing different arrangements or locations of pivot-points for the inclined block or plate.

A represents a suitable form of transmitter 6 boX or casing having a hinged front or removable door or cap,a,provided with a mouth piece, a, diaphragm B, having electrode I), and a standard or bracket, 0. Preferably to the latter is secured,in any suitable manner, as indicated at d, a block or plate, D, which is preferably of carbon, and has a groove, d, in the direction of its length. In'this groove rests a loose rolling electrode, E, which impinges against the diaphragmelectrode.

The block or plate D is independent of or separate from the diaphragm-that is to say, the block D may be moved to vary its inclination Without moving the diaphragm.

Back of the loose rolling electrode E,and resting upon the block D in an impingement with the electrode, is a loose rolling weight or bat last, F, for imparting to the electrode E an initial or normal contact-pressure, as desired, and this is accomplished by either using weights or ballast of different diameters or sizes,or of the same size,bnt of different gravities or densities necessary to produce the initial contact required. As this weight or ballast F is loose and independent of the electrode 0 E the motions or excursions of t-helatterduring the vibration of the diaphragm are imparted to the ballast F, and it partakes of all the movements of or operates in unison with the electrode E,and in a measure also serves as 5 a governor for electrode E during the time it is under the influence of the vibrations of the diaphragm. V

The rolling electrode E and weight F, as shown, are spheres or balls.

, or diameter different from that of electrode E,

or of a material having a density orv gravity different from or greater than that of saidelectrode, so that by using ballasts F of different sizes or densities the desired variation in the initial contact between the electrodes E and b may be obtained without altering the inclination of the block D. If desired, however, the loose rolling weight or ballast F may be used in connection with the pivoted block and adjusting-screw',as shown in Fig. 2, wherein the block is pivoted to standard'O, and the pivot for the block may be in the line of the transverse center or axis of electrode E, or located below the forward end of block D, as illustrated, respectively, in Figs. 3 and at.

In using the loose rolling weight or ballast upon a pivoted or an adjustable table or block, D, I do not confine myself to any particular mechanism for adjusting the block, as it is evident that numerous adjusting devices may be employed.

The electrode E may be made of carbon or other suitable material, and the weight F may be of glass, metal, or other suitable substance.

The electrodes are by means of suitable connections, 1 1, placed in circuit with a battery, 2, and the rimary coil of an inductori'um, 3,

- the secondary coil of which forms part of the line 4.

I am aware that a telephonic transmitter consisting of a diaphragm, a tubular casing secured to and moving with the frame for the diaphragm and having spherical electrod'esarranged in series, and springtension devices for varying the initial as well as the working contact of said electrodes is old. My device differs from that form in that the inclined block is separate from that diaphragm, and that the initial contact is varied by using dif ferent sizes of spheres,which are free to move away from the electrode in contact with the diaphragm. In other words, in my device there is no spring-tension or other analogous device to oppose the movement of the rolling weight away from the rolling electrode.

\Vhat I claim is- 1. In a telephonic transmitter, the combination, with a diaphragm, of a loose rolling electrode, a loose rolling weight or ballast free to move away from the electrode,whereby the initial contact of said electrode may be varied, as set forth. 4

2. In a telephonic transmitter, a diaphragm, a loose rolling electrode, aloose rolling weight or ballast, and an inclined table or block separate from said diaphragm for said loose electrode and ballast, substantially as set forth.

3. In a telephonictransmitter, a diaphragm, a loose rolling electrode, a loose rolling weight or ballast, a separate pivoted or adjustable block for said electrode and weight, and means for adjusting said block or table independent of the diaphragm,substantially as set forth. 4. The combination of diaphragm B, electrode b, loose rolling electrode E, loose rolling weight or ballast F, and block D, and devices for varying the inclination of the block without moving said diaphragm, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES w. on'rA.

' Witnesses:

S. J. VAN STAVOREN, J. DANIEL EBY. 

